2009-02-28

Emacs 23,等到你啦

近乎绝望地等待,Emacs 23,终于见到你啦。想尝鲜的可以从这里下载:http://alpha.gnu.org/gnu/emacs/pretest/windows/

2009-02-26

『啤酒与尿布』的数据挖掘神话还要传多久

数据挖掘神话“啤酒与尿布”,这里有一份详细的调查报告:
Basically, I found the person in Blischok's group who ran the queries. K. Heath ran self joins
in SQL (1990), trying to find two itemsets that have baby items, which are particularly profitable. She found this beer and diapers pattern in their data of 50 stores over a day period. When I talked to her, she mentioned that she didn't think the pattern was significant, but it was interesting."

So what are the facts? In 1992, Thomas Blischok, manager of a retail consulting group at Teradata, and his staff prepared an analysis of 1.2 million market baskets from about 25 Osco Drug stores. Database queries were developed to identify affinities. The analysis "did discover that between 5:00 and 7:00 p.m. that consumers bought beer and diapers". Osco managers did NOT exploit the beer and diapers relationship by moving the products closer together on the shelves. This decision support study was conducted using query tools to find an association. The true story is very bland compared to the legend.

So if someone asks you about the story of "data mining, beer and diapers" you now know the facts. The story most people tell is fiction and legend. You can continue telling the story, but remember no matter how you tell it, the story of "data mining, beer and diapers" is NOT a good example of the possiblities for decision support with current data mining technologies.


调查结果:啤酒与尿布的数据关系虽不显著但很有意思;Osco并未利用这一发现,将啤酒与尿布特意就近放置。

2009-02-22

2009-02-21

2009-02-17

2009-02-16

产品黏性?品牌黏性?

朋友转来一篇文章《增强集团信息化用户黏性的一种做法》(张安胜),文章内容没什么新意,引起注意的是这文章气势,令人瞪目结舌,不愧来自中移动。

要想提高用户黏性,最常见的做法就是提高用户的转网成本,与手机用户相关的成本包括:资金成本机会成本

不想着为用户服务,嘴上说用户是上帝,却总惦着香火油。黏性,这很重要,当结构关系变化,可以起到缓冲作用。提高黏性,关键是要提高哪一种的黏性,用户与产品的黏性?还是用户与品牌的黏性?如果想要提高用户对品牌的黏性,恰恰最重要的是:降低用户与产品的黏性,用户用啥服务,换个顺手的,都感觉清清爽爽的,这个自在的,这才叫舒服。

正如张的文章所提的,高端用户不差钱,事实上,中低端用户也不会时时刻刻地总算计一分一里的。除了那些能够垄断的,在国内电器市场上,大家为啥一打就达到价格战上?!这还不是产品同志化(同质化)太严重闹得。祖上就留了那点房产,不算计自家兄弟,还能咋地。

See it and know it?

You see it, but it does not mean that you know it.

2009-02-14

酷!立体打印

三维打印的原理介绍


Z-Corp的三维打印机产品在展览会介绍



Z510打印过程

2009-02-10

央视新厦北配楼失火之前之后

下面第一副图片取自王鸿飞的博客,其它图片均取自潘石屹的博客

 

 




 




旁观者效应

科学松鼠会新有一篇介绍旁观者效应的文章

施助行为其实与城市的大小没有关系,而与人口的密集度有关系。人口的密集程度会导致两个效应:从众和责任分散。人们常常要以别人为参照物来定位自己,通过观察别人来判断自己是否正确,所以这就导致了多人在场时反应会变慢。同时每个人都以为别人会做,自己就不做了,或者抱着罚不责众的心态,所以也就没有人报警了。


央视新址北配楼大火发生后,围观群众愈集愈多,此时,人们似乎忘却了周围已重度污染的空气会导致肺部损伤,也少了许多维持通道畅通和秩序责任。

Measure it

"To measure is to know."

"If you can not measure it, you can not improve it."


2009-02-07

低俗与高雅

在这场“反低俗”运动中,严肃而不折腾,我们智慧的劳动人民总是能够将资本主义腐朽的、低俗的东西彻底改变为高雅的、民族的艺术品,将一切赤裸裸的套起来,人人有套穿。


注:上面图片取自此处

2009-02-03

又是一场扔鞋风波

温家宝总理在剑桥大学进行演讲的时候,突然冒出一声哨响,。。。





一职鞋就落在温总理一米远处,万幸未击中
 
 

令人佩服,温家宝总理这样得体、文雅地回应:
这种卑鄙的伎俩,是不能阻挡中英两国友谊的。